51545616 has 40 divisors (see below), whose sum is σ = 133562880. Its totient is φ = 17129856.

The previous prime is 51545609. The next prime is 51545639. The reversal of 51545616 is 61654515.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16465 + ... + 19343.

It is an arithmetic number, because the mean of its divisors is an integer number (3339072).

Almost surely, 2^51545616 is an apocalyptic number.

It is an amenable number.

51545616 is an abundant number, since it is smaller than the sum of its proper divisors (82017264).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51545616 is a wasteful number, since it uses less digits than its factorization.

51545616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3263 (or 3257 counting only the distinct ones).

The product of its digits is 18000, while the sum is 33.

The square root of 51545616 is about 7179.5275610586. The cubic root of 51545616 is about 372.1607583603.

The spelling of 51545616 in words is "fifty-one million, five hundred forty-five thousand, six hundred sixteen".